2005 Yukon Denali Gearing questions?

[Wyatt94]

so i got a 2005 Yukon denali i picked up for $1,000 to be a a project/ toy put new carpet in it redone gaskets and more now im about to pull motor to do a LQ9 swap and build for a LSA super charger, my plan is 500-600Hp max and make it so i can daily it drive it to the track and drive it back, anyways i been wondering on if i do 4:10 or 4:11 would it mess up anything with front diff being GT4 5x1 3:73 rear axle im new to the awd life lol i guess you can say never built an AWD vehicle before most of my stuff done on rwd or fwd only. so any info is greatly appreciated.

 

[Blackcar]

Pretty sure you need same diff ratio in both front and rear. You could pull drive shaft to front if four-wheel drive, but AWD won't work.

 

[Wyatt94]

Pretty sure you need same diff ratio in both front and rear. You could pull drive shaft to front if four-wheel drive, but AWD won't work.

how would i go about getting a front diff gearing or do i need to buy a whole front diff i havent found gears for front diff or could i use like a 01 2500hd 410 front diff would that work or silverado ss im guessing "only awd vehicles i know with 410 or 11 front gearing cant remember which one

 

[Blackcar]

If 2500HD front will fit that is exactly what I would do.

 

[S33k3r]

You ABSOLUTELY must match drive ratios in front and back or you will eat your transfer case. Also, a 2500HD front differential is unlikely to match with your 1500 transfer case. Keep in mind the 2500HD is going to be an 8 bolt axle and the Denali is going to be 6 bolt; the drive shafts are different between the two. I know because I have 2, 2500 8 bolt vehicles and 1 6 bolt vehicle (the 2003 Sierra Denali with AWD). And we got an incorrect -- 3.73 ratio -- front differential from Summit, and the rear was 4.10 (we ordered 5he correct ratio, they showed 5hey shipped the correct ratio, but 5hen we ACTUALLY received 5he 3.73 )

 

[Wyatt94]

You ABSOLUTELY must match drive ratios in front and back or you will eat your transfer case. Also, a 2500HD front differential is unlikely to match with your 1500 transfer case. Keep in mind the 2500HD is going to be an 8 bolt axle and the Denali is going to be 6 bolt; the drive shafts are different between the two. I know because I have 2, 2500 8 bolt vehicles and 1 6 bolt vehicle (the 2003 Sierra Denali with AWD). And we got an incorrect -- 3.73 ratio -- front differential from Summit, and the rear was 4.10 (we ordered 5he correct ratio, they showed 5hey shipped the correct ratio, but 5hen we ACTUALLY received 5he 3.73 )

i tried summit cant find front diff or do i need to look for rebuild kit because i cant find that either

 

[S33k3r]

When last I investigated, you could get a reman unit straight from GM. But that may have changed. I haven't looked at Summit in a while, but you might call them. Their phone people seem to be top notch.

 

[rockola1971]

Front and rear ratios have to match on AWD and 4wd vehicles. Otherwise the front and rearend are trying to turn at different speeds. Doing this on a AWD will destroy your Tcase. Do it on a 4wd and you will atleast destroy a pair of tires if not grenade the Tcase since it is magnesium and the weakest link between itself and all the hardened steel parts between your hubs and driveshaft coming off the Tcase. There are tons of places to call for differential parts online. Sierra Gear is my usual go to.

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